On Jul 10, Adrian von Bidder <avbidder@fortytwo.ch> wrote: > AFAICT, the protocol allows the receiving end to temporarily reject email, > and the sending end will retry. AFAICT QUIT is allowed after RCPT TO to > abort a mail transaction - and sender verification is no different from a > normal mail transaction in the view of the receiver. Correct. OTOH, sender verification is evil for a different reason: if a domain is forged by a spammer and a large number of systems receiving the spam perform sender verification, the MX of the forged domain will be DoS'ed. This is about as antisocial as vacation messages and replies by antivirus software. -- ciao, Marco
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